Embryology and Development — Flashcards

Flashcard 131: Development of eye:As the optic sulcus deepens, the wall of the _____ overlying the sulcus bulges outwards to form the optic vesicle.

Answer: prosencephalon

Flashcard 132: _____ cells migrate into the adrenal medulla to differentiate into chromaffin cells, which function as modified postganglionic sympathetic neurons.

Answer: Neural crest

Flashcard 133: The _____ layer in contact with the syncytiotrophoblast at the floor of the intervillous space (maternal side) is known as Rohr's layer.

Answer: fibrinoid

Extra: Placental Fibrinoid Layers: - **Rohr's layer**: Found at the floor of the intervillous space, in contact with the syncytiotrophoblast. - **Nitabuch's layer**: Found at the junction of the cytotrophoblast shell and the decidua basalis. (Note: This layer is absent in placenta accreta).

Flashcard 134: The male _____ are homologous to the female clitoris and vestibular bulbs, which both arise from the genital tubercle

Answer: corpus cavernosum and spongiosum

Flashcard 135: The male _____ is homologous to the female labia minora, which both arise from the urogenital folds

Answer: ventral shaft of penis (penile urethra)

Flashcard 136: _____ is a condition caused due to insufficient formation of mesoderm in the caudal most region of the embryo.

Answer: Sirenomelia

Flashcard 137: If there is a lack of Sertoli cells or MIF during development of a genotypically XY fetus, there is _____ internal genitalia and male external genitalia

Answer: both male and female

Flashcard 138: What are the adult derivatives of the wall of the diencephalon? _____ and hypothalamus

Answer: thalamus

Flashcard 139: _____ is a part of the wall of the neural tube that closes the cranial end of the prosencephalon

Answer: Lamina terminalis

Flashcard 140: The _____ (primary vesicle) matures into the metencephalon and myelencephalon (secondary vesicles)

Answer: hindbrain